Name: mc57594 Date: 03/03/97


I have never been able to get the jdb "dump" command to work.
Below are the exact steps with which you can reproduce the
problem using your TicTacToe demo.

I should also mention that I am displaying to a remote machine
running SunOS 4.1.3_U1, and I had to remove the
$JAVA_HOME/lib/font.properties file because of unavailable
fonts on my X server machine. I don't think that this is
related to my problem (TicTacToe runs fine without the debugger,
or if I avoid using jdb's "dump" command).

Core file (java) is available on request.


france:> uname -a
SunOS france 5.4 Generic_101945-32 sun4m sparc
france:> pwd
/nfs/u33/java/jdk1.1/demo/TicTacToe
france:> whence java
/nfs/u33/java/jdk1.1/bin/java
france:> java -version
java version "1.1_Final"
france:> whence javac
/nfs/u33/java/jdk1.1/bin/javac
france:> echo $CLASSPATH
.:/nfs/u33/java/jdk1.1/lib/classes.zip:/nfs/u33/java/jdk1.1/lib
france:> mv TicTacToe.class TicTacToe.class.ORIG
france:> javac -g *.java
france:> appletviewer -debug example1.html
Initializing jdb...
0xee32e1c0:class(sun.applet.AppletViewer)
> stop in TicTacToe.paint
Breakpoint set in TicTacToe.paint
> run
run sun.applet.AppletViewer example1.html
running ...
main[1]
Breakpoint hit: TicTacToe.paint (TicTacToe:224)
AWT-EventQueue-0[1] locals
Method arguments:
  this = TicTacToe[panel1,0,0,120x120,layout=java.awt.FlowLayout]
  g = sun.awt.motif.X11Graphics[0,0]
Local variables:
  d is not in scope.
  xoff is not in scope.
  yoff is not in scope.
  i is not in scope.
  r is not in scope.
  c is not in scope.
AWT-EventQueue-0[1] print this
this = TicTacToe[panel1,0,0,120x120,layout=java.awt.FlowLayout]
AWT-EventQueue-0[1] dump this
this = (TicTacToe)0xee2f53f8 {
    transient ComponentPeer peer =
The communications channel closed.
Internal exception:
java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java)
at sun.tools.debug.RemoteAgent.readValue(RemoteAgent.java:256)
at sun.tools.debug.RemoteAgent.getSlotValue(RemoteAgent.java:815)
at sun.tools.debug.RemoteField.getValue(RemoteField.java:57)
at sun.tools.debug.RemoteObject.getFieldValue(RemoteObject.java:84)
at sun.tools.ttydebug.TTY.print(TTY.java:1164)
at sun.tools.ttydebug.TTY.executeCommand(TTY.java:1218)
at sun.tools.ttydebug.TTY.<init>(TTY.java:1359)
at sun.tools.ttydebug.TTY.main(TTY.java:1436)
Internal exception: java.io.EOFException
at java.io.DataInputStream.readUnsignedShort(DataInputStream.java)
at java.io.DataInputStream.readUTF(DataInputStream.java)
at java.io.DataInputStream.readUTF(DataInputStream.java)
at sun.tools.debug.RemoteAgent.getThreadName(RemoteAgent.java:619)
at sun.tools.debug.RemoteThread.getName(RemoteThread.java:45)
at sun.tools.ttydebug.TTY.printPrompt(TTY.java:70)
at sun.tools.ttydebug.TTY.<init>(TTY.java:1344)
at sun.tools.ttydebug.TTY.main(TTY.java:1436)
france:>

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